Stealth Rock is a Rock type move that deals damage when the opponent switches Pokémon similar to Spikes. Base damage is 12.5, it will deal 6.125% with 4x resistance, 12.5 with 2x resistance, and 25% for 2x weakness, 50% for 4x weakness. Stealth Rock will stay in play until your opponent uses either Rapid Spin or Defog. Pokémon with ability Magic Guard are not affected by Stealth Rock.